Not a T within a Crown, but a Crowned T
http://www.mosinnagant.net/global%20mosin%20nagants/serbmosin.asp Crown T - The Crown/T is an established Serbian marking, which survived into the post WWI era. It has been found as a prominent mark on the Serbian Model 1899/07 as well as a wide variety of other weapons, which were used by the Serbs during and after WWI. I know of three Model 95 Mannlicher Stutzens or Stutzenkarabiniers, which are marked with a Crown/T and in one instance, a Crown/H as well. It is impossible to confirm whether these rifles were marked as captured reissued weapons during WWIor as war reparations after 1918. In addition, the Turkish Model 1890 rifles that were converted into short rifle configuration following WWI by the Kingdom of Serbs, Croats and Slovenes (later day Yugoslavia),were universally marked with a Crown/T. Either way, there is no question that this mark was used by the Serbs before, during and after, WWI.